Puzzles
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Source: Futility Closet
In my house are a number of rooms. (A hall separated from the rest of the house by one or more doors counts as a room.) Each room has an even number of doors, including doors that lead outside. Is the total number of outside doors even or odd?
If you enjoyed this puzzle, check out Sunday Afternoon Maths XXII,
puzzles about numbers, or a random puzzle.
puzzles about numbers, or a random puzzle.